package com.zuihai.app.mvp.ui.utils;

/**
 * Created by Panda_Program on 2018/9/16 0016.
 */

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;

/**
 * 处理背景图片的一些工具，如放大 缩小...
 */
public class BgUtils {

    /**
     * 使背景图片适应手机屏幕分辨率
     *
     * @param context        上下文环境
     * @param screenWidth    手机屏幕宽度
     * @param screenHeight   手机屏幕高度
     * @param resId          背景图片资源ID
     * @return               返回一个新的适应手机屏幕分辨率的图片
     */
    public static Bitmap getSuitableBg(Context context, int screenWidth, int screenHeight, int resId) {
        Bitmap bg = BitmapFactory.decodeResource(context.getResources(), resId);
        int bgWidth = bg.getWidth();
        int bgHeight = bg.getHeight();
        float scaleWidth = (float) screenWidth / bgWidth;
        float scaleHeight = (float) screenHeight / bgHeight;
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap newBg = Bitmap.createBitmap(bg, 0, 0, bgWidth, bgHeight, matrix, true);
        return newBg;
    }
}
